How do I return faulty item when seller is ignoring my messages?

I recently bought a heated vest for my elderly mother, for Mothers Day.

When she tried to use it, it wasn't working. I visited her the following week thinking she didn't know how to use the item, but I could not get it to heat up. I contacted the seller, let them know it was faulty, but havent heard back, after numerous messages.   Ebay sent me a standard email saying they will step in if the matter is not resolved. That was weeks ago.  What are my options?

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As said, you open and follow through with a dispute

 

The seller does not need to reply for you to do this

 

*Edit

 

 

Sorry, if it was for Mother's Day (May) you are out of time for eBay

 

Unless it is still within 30 days of the last estimated delivery date

 

 

How did you pay?